Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Dutch]

Right boys,  not a good one for the electrickery club again.

Went sailing today and halfway up to the boat park MIL light came on and truck went into limp home mode.

Fault code P0702 & P0703.  Checked WJJeeps.com.

P0702
Transmission Control System Electrical
P0703 (M)
Brake Switch Stuck Pressed or Released
Incorrect input state detected in the brake switch circuit. (Changed from P1595).

Calling doctor Mike for some plain english

[isle of man]

Dutch relax it's only your brake light switch!!!

[Dutch]

Dutch relax it's only your brake light switch!!!

I'm pretty relaxed about it......just a bit awkward to have 25 shitboxes up your arse driving home at 30mph....and then on the first dual bit ..THE LOOKS they give you 

Soooooo....what do I do about the f*&^%$£%%&ing brake light switch 

[j33pky]

mend it?

[isle of man]

Not sure it's the same but EBay...

http://cgi.ebay.co.uk/1999-01-JEEP-GRAND-CHEROKEE-3-1L-DIESEL-BRAKE-SWITCH-/360294083672?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item53e3336c58

I would recommend main dealer part!!!

[Mike Pavelin]

I think I would check the brake switch

[Mike Pavelin]

Not sure it's the same but EBay...

http://cgi.ebay.co.uk/1999-01-JEEP-GRAND-CHEROKEE-3-1L-DIESEL-BRAKE-SWITCH-/360294083672?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item53e3336c58

I would recommend main dealer part!!!

So would I, I believe the last new one I bought was cheaper than that used one.

[Mike Pavelin]

Here are all the possibilities. You might want to try the brake switch first. After that, it's off to the dealer.                                                       P0702 TRANS CONTROL ABS SENSOR MESSAGE
P0702-TRANS CONTROL ENGINE T-CASE SWITCH MESSAGE
P0702-TRANS CONTROL IMPROPER GEAR
P0702-TRANS CONTROL IMPROPER RATIO OR TRANSMISSION SLIPPING
P0702-TRANS CONTROL INTERNAL SHIFTER FAILURE
P0702-TRANS CONTROL N2 OR N3 INPUT SENSOR CIRCUIT
P0702-TRANS CONTROL TCC FAULT
P0703-BRAKE SWITCH SIGNAL CIRCUITS PLAUSIBILITY WITH REDUNDANT
CONTACT
P0703-BRAKE SWITCH SIGNAL CKTS PLAUS W/REDUNDANT CONTACT AFTER
INITIALIZATION

[isle of man]

It's the brake switch see the same bollocks here for Smart cars...

[Panic mechanic!]

got to admit been there and done that with a smart car!

[Dutch]

mend it?

So Mr. smart alec explain me this :

Spent some time upside down under the dash just now and :

- On the brake pedal there is a flat bit that connects with the switch plunger.  When you depress the pedal the plunger comes out and activates the brake-lights.
- Checked the fuse and found it was blown.  Replace fuse and brake lights come on instantly and remain on & find that brake pedal is not connecting with plunger which is odd.
- Find a bit of 3 mill. sticky back felt (for under legs of chairs to prevent scratching wood floors) stick on pedal, relase pedal, pedal connects, lights go out.
- pump a few times and lights work fine.
- Drive around the square and MIL light (&limp home mode) still very much in evidence.

 

[Tank]

Maybe needs a battery disconnect to reset everything.........always seems to be the thing on Jeeps 

[isle of man]

Maybe needs a battery disconnect to reset everything.........always seems to be the thing on Jeeps 

Second that one....

[Dutch]

Maybe needs a battery disconnect to reset everything.........always seems to be the thing on Jeeps 

Ahhhh....good one Tank. I'm off again.......(hold the phone)

 

[Mike Pavelin]

The plunger ratchets in and out, You may have accidentally pulled the brake pedal up higher than it's meant to go at some point. If you pull it out one click (it's quite hard) you can get rid of your packing piece. However, this is a double switch, one circuit does the brake lights, but both are monitored by various systems and they have to both work correctly and simultaneously or they will throw up various faults. Try disconnecting the battery for a minute and see if it comes out of limp mode.

[Mike Pavelin]

More info.....
P0703-BRAKE SWITCH SIGNAL CIRCUITS PLAUSIBILITY WITH
REDUNDANT CONTACT
P0703-BRAKE SWITCH SIGNAL CKTS PLAUS W/REDUNDANT
CONTACT AFTER INITIALIZATION
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0703-BRAKE SWITCH SIGNAL
CIRCUITS PLAUSIBILITY WITH REDUNDANT CONTACT.
When Monitored and Set Condition:
P0703-BRAKE SWITCH SIGNAL CIRCUITS PLAUSIBILITY WITH REDUNDANT
CONTACT
When Monitored: With the ignition on.
Set Condition: The ECM detects the Primary Brake Switch Signal circuit and Secondary
Brake Switch Signal circuit inputs to the ECM do not agree.
P0703-BRAKE SWITCH SIGNAL CKTS PLAUS W/REDUNDANT CONTACT AFTER
INITIALIZATION
When Monitored: With the ignition on.
Set Condition: The ECM detects the Primary Brake Switch Signal circuit and Secondary
Brake Switch Signal circuit inputs to the ECM do not agree.
POSSIBLE CAUSES
INTERMITTENT CONDITION
BRAKE LAMP SWITCH - SECONDARY OPEN
BRAKE LAMP SWITCH FUSED B+ CIRCUIT OPEN
SECONDARY BRAKE SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
BRAKE LAMP SWITCH - PRIMARY OPEN
SECONDARY BRAKE SWITCH GROUND CIRCUIT OPEN
SECONDARY BRAKE SWITCH SIGNAL CIRCUIT OPEN
PRIMARY BRAKE SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE
PRIMARY BRAKE SWITCH SIGNAL CIRCUIT OPEN
ENGINE CONTROL MODULE - INTERNAL
ENGINE CONTROL MODULE - PRIMARY BRAKE SIGNAL
ENGINE CONTROL MODULE - SECONDARY BRAKE SIGNAL
163
DRIVEABILITY - DIESEL

[Dutch]

Maybe needs a battery disconnect to reset everything.........always seems to be the thing on Jeeps 

Ahhhh....good one Tank. I'm off again.......(hold the phone)

 

Naaaaaahhhh.......no go.....would have been toooo easy.  MIL and faultcodes still active.

Since this switch does multiple circuits I must assume that it is fubar (busted fuse would be the indicator).

And before before I forget, thanks for all your help.   

I think its a phonecall to the dealer first thing tomorro and see where that takes me.

[Bishops Finger]

Dutch Try disconnecting the battery..and leave it that way for 20 minutes..